From now on, audiences who read the rolling credits of a movie will know that the name (or names) after the words produced by refers to the actual producer of the film -- and not just a perk handed out to an actor or writer as part of an overall deal, as is sometimes the case. The Producers Guild of America announced today (Thursday) that the Walt Disney Co., Paramount and Warner Bros. had become the last of the major studios to accept the organization's credits certification. The Weinstein Co., 20th Century Fox, Sony and Universal had previously agreed to the certification, in which the letters p.g.a. will appear after the approved name of a producer. To qualify, a producer must have substantial involvement in the development, pre-production, production and postproduction/marketing of a film. The producer, however, does not necessarily have to be a member of the PGA.